At first pass, this all seems a little misleading, because you can't opt out of the existing economy and only participate in the digital economy as long as the governments that create and run the traditional economies and currencies control the means of exchange. This means all the fiat currencies that you convert other currencies into in order to buy something, all the physical infrastructure and computing systems that comprise the internet (including your own computers and phones), and all the physical protections that tax-funded militaries provide to this infrastructure. Fiat currencies don't exist in a vacuum, they are a product of small groups of people who have decided to create national currencies without any input from the citizens of the countries these currencies trade in. And I doubt these people are going to give up this control or the ridiculous levels of wealth and power it provides them without a very brutal fight. In other words, it's a fun game for now, but as long as any government can simply shut off your connection to the internet at will (and you better believe they can, unless you possess a very special set of skills, and probably your own amount of ridiculous wealth), then all these exchanges are still happening at the discretion of these governments, controlled by these small groups of people. I hope I'm wrong, but it would seem you would need to be able to build your own computer and network to connect it to someone else's computer who also built their own, in order to truly opt out of the existing economy. And even then, you would need to go undetected in the event that these people decided you were threatening their power. I suppose it's... possible. But it seems much more realistic to see all of this as a fun game within their game, and to keep a watchful eye for their moves to circumscribe, coopt and corrupt it at any moment.